//
// Created by xiao on 2024/7/19.
//
#include <array>
#include <vector>


int main(int argc, char const *argv[])
{

    int a1[4] = {1,2,3,4};
    std::vector<int> a2(4);
    a2[0] = 1;
    a2[1] = 2;
    a2[2] = 3;
    a2[3] = 4;

    std::array<int, 4> a3 = {1,2,3,4};

    

}